In the following question, four similar-looking words are given, out of which only one word is correctly spelt. Select the correctly spelt word related to the idea of twisting or deforming.

Introduction / Context:
Spelling recognition questions ask you to choose the correctly spelled standard English word among several near lookalikes. Here, all four options resemble possible forms of a word related to twisting, bending, or deforming. The real English noun for a twisted or distorted shape is "contortion", and your task is to recognise its correct spelling among distractors that include misplaced vowels and consonants.

Given Data / Assumptions:

• Options: conturtion, contorsion, contortion, contursion.
• Intended target word: contortion, meaning a twisted position or distortion of the body or object.
• All other forms are non standard spellings that might seem plausible at first glance.

Concept / Approach:
The noun "contortion" is formed from the verb "contort", meaning to twist or bend out of shape, plus the suffix "-ion". Therefore, the correct spelling keeps the root contort intact and adds ion: contortion. Variants that change the vowel sequence or insert extra letters break the connection with the root verb and do not match any standard dictionary form. Comparing each option with the base word contort helps quickly identify the correct spelling.

Step-by-Step Solution:
Step 1: Recognise that the base verb is "contort", spelled c o n t o r t. Step 2: Form the noun by adding the suffix "-ion", keeping the root intact, yielding c o n t o r t i o n, or "contortion". Step 3: Examine option C: contortion. This exactly matches the root plus suffix pattern and is a familiar word in English. Step 4: Examine option A: conturtion. Here, the vowel sequence "ur" breaks the link with "contort" and does not correspond to a recognised English word. Step 5: Examine option B: contorsion. This looks like "contorsion" with an extra s and altered vowel order; the correct related word with s is "contorsionist", but the base noun is still "contortion". Step 6: Examine option D: contursion. This again introduces "urs" instead of "ort", destroying the connection with "contort". Step 7: Conclude that "contortion" is the only correctly spelled standard word.

Verification / Alternative check:
Think of common usages: "His face twisted into a grotesque contortion of rage," or "Acrobats often perform dramatic contortions of the body." You will nearly always see "contortion" in such contexts, not any of the other spellings. Checking a reliable dictionary will also show "contortion" and "contortionist" as the recognised forms derived from "contort."

Why Other Options Are Wrong:
"Conturtion" is wrong because the sequence "ur" does not match the root "tort" in "contort" and appears in no standard dictionary entry. "Contorsion" is wrong as a spelling of this noun; while "contorsion" can appear in specialised contexts in some languages, English standard usage prefers "contortion" for the meaning tested here. "Contursion" is wrong because it mixes letters from unrelated roots and does not correspond to a normal English word.

Common Pitfalls:
A common mistake is to judge by sound alone, where "contortion" and "contorsion" might sound similar when spoken quickly. Another trap is to be distracted by uncommon but vaguely familiar patterns like "-sion", which appear in many nouns, and assume they must be correct. Remember to look for the recognizable root "contort" and then simply add "-ion" without changing the internal letters.

Final Answer:
The correctly spelled word is contortion.